GF80.50-P-2004CW Anti-Theft Alarm System Trigger, Function
GF80.50-P-2004CW Anti-Theft Alarm System Trigger, Function
- with CODE (551) Anti-theft alarm system (ATA [EDW])
Function requirements:
^ Anti-theft alarm system (ATA) activated
General
If one of the alarm inputs of the activated ATA exits its non- actuated state, an alarm is triggered.
Alarm actuation in the event of undervoltage
The operating voltage range of the ATA is defined from U = 8.5 to 15.5 V. If the voltage drops below ≤8.5 V, it is no longer possible to trigger a visual alarm output. Only an acoustic alarm is triggered. The battery voltage is stored in the ATA alarm memory in the rear SAM control unit with fuse and relay module (N10/2).
Function sequence for ATA alarm actuation, general
The ATA alarm actuation comprises several partial functions. These are:
^ Alarm actuation by opening a door, the trunk lid or the engine hood
^ Alarm actuation by changing vehicle inclination (not United States Of America, Canada and Japan)
^ Alarm actuation by motion in interior compartment (with code (882) Interior monitoring (only with ATA))
^ Alarm actuation from communication loss to alarm siren (H3/1)
^ Emergency opening (only United States of America)
^ Alarm sounding
^ Alarm interruption
Function sequence for alarm actuation by opening a door, trunk lid or engine hood
The rear SAM control unit actuates an alarm as soon as the nonactuated state of one of the following switches is interrupted for t > 0.5 s:
^ Left front door rotary tumbler switch (A85s1)
^ Right front door rotary tumbler switch (A85/1s1)
^ Left rear door rotary tumbler switch (A85/3s1)
^ Right rear door rotary tumbler switch (A85/4s1)
^ Trunk lid rotary tumbler switch (M14/7s1)
^ Engine hood anti-theft alarm switch (S62)
The status of the front door rotary tumbler switch is transmitted by the left front door control unit (N69/1) and right front door control unit (N69/2) to the rear SAM control unit with interior CAN. The remaining switches are read in directly by the rear SAM SAM control unit.
For a new alarm actuation, the corresponding switch must first change to the non-actuated state (debounce time t = 500 ms).
After a non-actuated state of t = 10 s an alarm can be reactuated by the same switch, if an acoustic alarm is not present.
If a locked vehicle is unlocked with the mechanical key and the door is opened, the ATA triggers an alarm.
Alarm actuation due to change of vehicle inclination
Additional function requirements
^ Tow-away protection not deactivated
Function sequence for alarm actuation due to change of vehicle inclination
If the inclination sensor integrated into the alarm siren recognizes an alarm-relevant inclination, an alarm is output. The corresponding signal is relayed to the rear SAM control unit with the rear SAM-LIN.
Actuation criterion:
^ Change of vehicle inclination (around horizontal axis) by 1° to -1°, ±0.2°
An alarm is recognized before a wheel looses contact with the ground when raising the vehicle.
Alarm actuation by motion in the interior compartment
Additional function requirements
^ Interior protection not deactivated
Function sequence for alarm actuation from motion in interior compartment
The interior protection and tow-away protection control unit (N26/6) is read in by the rear SAM control unit with rear SAM-LIN. If a movement in the vehicle interior is recognized and considered to be alarm-relevant, an alarm is output.
During activated rain closing on vehicles with tilting/sliding roof (SR) (with code (414) Power glass tilting/sliding roof) or panoramic roof (with code (413) Panoramic glass roof with top sliding roof), the interior compartment is not monitored. After closing or after expiration of t = 35 s, the interior protection is reactivated.
Function sequence for alarm triggering from communication loss to alarm siren
The alarm siren is actuated cyclically approx. every t = 700 ms by the rear SAM control unit with rear SAM-LIN. If a reply to this request is not received within t = 1 s by the alarm siren (no communication), the rear SAM control unit and alarm siren trigger an alarm. If the alarm siren detects a loss in the supply voltage, it also outputs an acoustic alarm automatically.
An alarm is only repeated if a new alarm event is registered after the active acoustic alarm was terminated.
Function sequence for emergency opening
The trunk lid emergency opening switch (S88/10) ensures that the trunk lid can also be opened from the inside of the trunk lid when the vehicle is locked. The rear SAM control unit reads in and evaluates the trunk lid emergency opening switch. The ATA triggers an alarm when the trunk lid emergency opening switch is actuated.
Function sequence for alarm output
The following components of the exterior lights are actuated:
^ by the front SAM control unit:
- Left front turn signal lamp (E1e5)
- Right front turn signal lamp (E2e5
^ by the rear SAM control unit:
- Left rear turn signal lamp (E3e1)
- Right rear turn signal lamp (E4e1)
^ by the left front door control unit:
- Left outside mirror turn signal lamp (E6/5)
^ by the right front door control unit:
- Right outside mirror turn signal lamp (E6/6)
The acoustic alarm is output by actuating the alarm siren by the rear SAM control unit with rear SAM-LIN.
The interior lights are switched on by the front SAM control unit.
Function sequence for alarm interruption
An alarm is interrupted by opening the central locking (CL) of the vehicle with the transmitter key (A8/1) or by switching on circuit 15C (valid transmitter key inserted into electronic ignition switch control unit (N73).
The electronic ignition switch control unit transmits the corresponding signal with interior CAN to the rear control unit, which then terminates the activated alarm.
